气候变化领域集成服务门户(CCPortal): Boundary layer structure characteristics under objective classification of persistent pollution weather types in the Beijing area

CCPortal

DOI	10.5194/acp-21-8863-2021
	Boundary layer structure characteristics under objective classification of persistent pollution weather types in the Beijing area
	Sun Z.; Zhao X.; Li Z.; Tang G.; Miao S.
发表日期	2021
ISSN	1680-7316
起始页码	8863
结束页码	8882
卷号	21 期号:11
英文摘要	Different types of pollution boundary layer structures form via the coupling of different synoptic systems and local mesoscale circulation in the boundary layer; this coupling contributes toward the formation and continuation of haze pollution. In this study, we objectively classify the 32 heavy haze pollution events using integrated meteorological and environmental data and ERA-Interim analysis data based on the rotated empirical orthogonal function method. The thermodynamic and dynamic structures of the boundary layer for different pollution weather types are synthesized, and the corresponding three-dimensional boundary layer conceptual models for haze pollution are constructed. The results show that four weather types mainly influence haze pollution events in the Beijing area: (a) type 1 - southerly transport, (b) type 2 - easterly convergence, (c) type 3 - sinking compression, and (d) type 4 - local accumulation. The explained variances in the four pollution weather types are 43.69 % (type 1), 33.68 % (type 2), 16.51 % (type 3), and 3.92 % (type 4). In persistent haze pollution events, type 1 and type 2 surpass 80 % on the first and second days, while the other types are present alternately in later stages. The atmospheric structures of type 1, type 2, and type 3 have typical baroclinic characteristics at mid-high latitudes, indicating that the accumulation and transport of pollutants in the boundary layer are affected by coupled structures in synoptic-scale systems and local circulation. The atmospheric structure of type 4 has typical barotropic characteristics, indicating that the accumulation and transport of pollutants is primarily affected by local circulation. In type 1, southerly winds with a specific thickness and intensity prevail in the boundary layer, which is favorable for the accumulation of pollutants in plain areas along the Yan and Taihang Mountains, whereas haze pollution levels in other areas are relatively low. Due to the interaction between weak easterly winds and the western mountains, pollutants accumulate mainly in the plain areas along the Taihang Mountains in type 2. The atmospheric vertical structure is not conducive to upward pollutant diffusion. In type 3, the heights of the inversion and boundary layers are the lowest due to a weak sinking motion while relative humidity is the highest among the four types. The atmosphere has a small capacity for pollutant dispersion and is favorable to particulate matter hygroscopic growth; as a result, type 3 has the highest PM2.5 concentration. In type 4, the boundary layer is the highest among the four types, the relative humidity is the lowest, and the PM2.5 concentration is relatively lower under the influence of local mountain-plain winds. Different weather types will shape significantly different structures of the pollution boundary layer. The findings of this study allow us to understand the inherent difference among heavy pollution boundary layers; in addition, they reveal the formation mechanism of haze pollution from an integrated synoptic-scale and boundary layer structure perspective. We also provide scientific support for the scientific reduction of emissions and air quality prediction in the Beijing-Tianjin-Hebei region of China. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.
语种	英语
scopus关键词	atmospheric pollution; boundary layer; classification; empirical orthogonal function analysis; haze; mesoscale motion; synoptic meteorology; weather; Beijing [China]; China
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246819
作者单位	Institute of Urban Meteorology, China Meteorological Administration, Beijing, 100089, China; Environmental Meteorology Forecast Center of Beijing-Tianjin-Hebei, Beijing, 100089, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 102300, China
推荐引用方式 GB/T 7714	Sun Z.,Zhao X.,Li Z.,et al. Boundary layer structure characteristics under objective classification of persistent pollution weather types in the Beijing area[J],2021,21(11).
APA	Sun Z.,Zhao X.,Li Z.,Tang G.,&Miao S..(2021).Boundary layer structure characteristics under objective classification of persistent pollution weather types in the Beijing area.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(11).
MLA	Sun Z.,et al."Boundary layer structure characteristics under objective classification of persistent pollution weather types in the Beijing area".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.11(2021).